Black preview screen (Arch Linux, flowblade 2.12)

[Perdu]

1. Flowblade version (Help->About):

2.12

2. MLT version (Help->Runtime Environment):

7.22.0

3. Your distribution (Ubuntu, Debian, Mint etc.):

Arch Linux

4. If possible, try to provide step-by-step instructions on how to reproduce the issue. From developer point of view this is the easieast way to understand what is happening.:

I just installed flowblade on Arch Linux, but I can't get the preview screen to work. I add a video to the project, move it to the tracks, and when I play I get sound but no image.

CLI output when I start: (not sure why I have errors on lib files as they do exist and are readable by the user)

Application version: 2.12.0
OS: Arch Linux
Python 3.11.6 (main, Nov 14 2023, 09:36:21) [GCC 13.2.1 20230801]
GTK+ version: 3.24.39
Locale: en_US
Found translations at /usr/lib/python3.11/site-packages/Flowblade/locale/, using those.
Use OS locale language.
Valid shortcut files found: ['flowblade.xml', 'premiere.xml']
Keyboard shortcuts file: flowblade.xml
Using Full Screen size for layout: 1920 x 1080
Small height: False
Small width: False
mlt_repository_init: failed to dlopen /usr/lib/mlt-7/libmltmovit.so
  (libmovit.so.8: cannot open shared object file: No such file or directory)
mlt_repository_init: failed to dlopen /usr/lib/mlt-7/libmltsox.so
  (libsox.so.3: cannot open shared object file: No such file or directory)
mlt_repository_init: failed to dlopen /usr/lib/mlt-7/libmltrtaudio.so
  (librtaudio.so.7: cannot open shared object file: No such file or directory)
Detecting environment...
---
video_codecs:
  - a64multi
  - a64multi5
  - alias_pix
  - amv
  - apng
  - asv1
  - asv2
  - avrp
  - avui
  - ayuv
  - bitpacked
  - bmp
  - cfhd
  - cinepak
  - cljr
  - dnxhd
  - dpx
  - dvvideo
  - exr
  - ffv1
  - ffvhuff
  - fits
  - flashsv
  - flashsv2
  - flv
  - gif
  - h261
  - h263
  - h263p
  - hap
  - huffyuv
  - jpeg2000
  - jpegls
  - ljpeg
  - magicyuv
  - mjpeg
  - mpeg1video
  - mpeg2video
  - mpeg4
  - msmpeg4v2
  - msmpeg4
  - msrle
  - msvideo1
  - pam
  - pbm
  - pcx
  - pfm
  - pgm
  - pgmyuv
  - phm
  - png
  - ppm
  - prores
  - prores_aw
  - prores_ks
  - qoi
  - qtrle
  - r10k
  - r210
  - rawvideo
  - roqvideo
  - rpza
  - rv10
  - rv20
  - sgi
  - smc
  - snow
  - speedhq
  - sunrast
  - svq1
  - targa
  - tiff
  - utvideo
  - v210
  - v308
  - v408
  - v410
  - vbn
  - vc2
  - wbmp
  - wrapped_avframe
  - wmv1
  - wmv2
  - xbm
  - xface
  - xwd
  - y41p
  - yuv4
  - zlib
  - zmbv
  - hdr
  - libaom-av1
  - libjxl
  - libopenjpeg
  - librav1e
  - libsvtav1
  - libtheora
  - libvpx
  - libvpx-vp9
  - libwebp_anim
  - libwebp
  - libx264
  - libx264rgb
  - libx265
  - libxvid
  - h263_v4l2m2m
  - av1_nvenc
  - av1_qsv
  - av1_amf
  - av1_vaapi
  - h264_amf
  - h264_nvenc
  - h264_qsv
  - h264_v4l2m2m
  - h264_vaapi
  - hevc_amf
  - hevc_nvenc
  - hevc_qsv
  - hevc_v4l2m2m
  - hevc_vaapi
  - mjpeg_qsv
  - mjpeg_vaapi
  - mpeg2_qsv
  - mpeg2_vaapi
  - mpeg4_v4l2m2m
  - vp8_v4l2m2m
  - vp8_vaapi
  - vp9_vaapi
  - vp9_qsv
  - vnull
...
---
audio_codecs:
  - comfortnoise
  - s302m
  - aac
  - ac3
  - ac3_fixed
  - alac
  - aptx
  - aptx_hd
  - dca
  - dfpwm
  - eac3
  - flac
  - g723_1
  - mlp
  - mp2
  - mp2fixed
  - nellymoser
  - opus
  - real_144
  - sbc
  - sonic
  - sonicls
  - truehd
  - tta
  - vorbis
  - wavpack
  - wmav1
  - wmav2
  - pcm_alaw
  - pcm_bluray
  - pcm_dvd
  - pcm_f32be
  - pcm_f32le
  - pcm_f64be
  - pcm_f64le
  - pcm_mulaw
  - pcm_s8
  - pcm_s8_planar
  - pcm_s16be
  - pcm_s16be_planar
  - pcm_s16le
  - pcm_s16le_planar
  - pcm_s24be
  - pcm_s24daud
  - pcm_s24le
  - pcm_s24le_planar
  - pcm_s32be
  - pcm_s32le
  - pcm_s32le_planar
  - pcm_s64be
  - pcm_s64le
  - pcm_u8
  - pcm_u16be
  - pcm_u16le
  - pcm_u24be
  - pcm_u24le
  - pcm_u32be
  - pcm_u32le
  - pcm_vidc
  - roq_dpcm
  - adpcm_adx
  - adpcm_argo
  - g722
  - g726
  - g726le
  - adpcm_ima_amv
  - adpcm_ima_alp
  - adpcm_ima_apm
  - adpcm_ima_qt
  - adpcm_ima_ssi
  - adpcm_ima_wav
  - adpcm_ima_ws
  - adpcm_ms
  - adpcm_swf
  - adpcm_yamaha
  - libgsm
  - libgsm_ms
  - libmp3lame
  - libopencore_amrnb
  - libopus
  - libspeex
  - libvorbis
  - anull
...
---
formats:
  - a64
  - ac3
  - ac4
  - adts
  - adx
  - aiff
  - alp
  - amr
  - amv
  - apm
  - apng
  - aptx
  - aptx_hd
  - argo_asf
  - argo_cvg
  - asf
  - ass
  - ast
  - asf_stream
  - au
  - avi
  - avif
  - avm2
  - avs2
  - avs3
  - bit
  - caf
  - cavsvideo
  - codec2
  - codec2raw
  - crc
  - dash
  - data
  - daud
  - dfpwm
  - dirac
  - dnxhd
  - dts
  - dv
  - eac3
  - evc
  - f4v
  - ffmetadata
  - fifo
  - fifo_test
  - filmstrip
  - fits
  - flac
  - flv
  - framecrc
  - framehash
  - framemd5
  - g722
  - g723_1
  - g726
  - g726le
  - gif
  - gsm
  - gxf
  - h261
  - h263
  - h264
  - hash
  - hds
  - hevc
  - hls
  - ico
  - ilbc
  - image2
  - image2pipe
  - ipod
  - ircam
  - ismv
  - ivf
  - jacosub
  - kvag
  - latm
  - lrc
  - m4v
  - md5
  - matroska
  - matroska
  - microdvd
  - mjpeg
  - mlp
  - mmf
  - mov
  - mp2
  - mp3
  - mp4
  - mpeg
  - vcd
  - mpeg1video
  - dvd
  - svcd
  - mpeg2video
  - vob
  - mpegts
  - mpjpeg
  - mxf
  - mxf_d10
  - mxf_opatom
  - null
  - nut
  - obu
  - oga
  - ogg
  - ogv
  - oma
  - opus
  - alaw
  - mulaw
  - vidc
  - f64be
  - f64le
  - f32be
  - f32le
  - s32be
  - s32le
  - s24be
  - s24le
  - s16be
  - s16le
  - s8
  - u32be
  - u32le
  - u24be
  - u24le
  - u16be
  - u16le
  - u8
  - psp
  - rawvideo
  - rm
  - roq
  - rso
  - rtp
  - rtp_mpegts
  - rtsp
  - sap
  - sbc
  - scc
  - film_cpk
  - segment
  - stream_segment,ssegment
  - smjpeg
  - smoothstreaming
  - sox
  - spx
  - spdif
  - srt
  - streamhash
  - sup
  - swf
  - tee
  - 3g2
  - 3gp
  - mkvtimestamp_v2
  - truehd
  - tta
  - ttml
  - uncodedframecrc
  - vc1
  - vc1test
  - voc
  - vvc
  - w64
  - wav
  - webm
  - webm_dash_manifest
  - webm_chunk
  - webp
  - webvtt
  - wsaud
  - wtv
  - wv
  - yuv4mpegpipe
  - alsa
  - fbdev
  - opengl
  - oss
  - pulse
  - sdl,sdl2
  - video4linux2,v4l2
  - xv
...
MLT detection succeeded, 185 formats, 130 video codecs and 83 audio codecs found.
618 MLT services found.
Loading render profiles...
ffmpeg version n6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 13.2.1 (GCC) 20230801
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
libavutil      58. 29.100 / 58. 29.100
libavcodec     60. 31.102 / 60. 31.102
libavformat    60. 16.100 / 60. 16.100
libavdevice    60.  3.100 / 60.  3.100
libavfilter     9. 12.100 /  9. 12.100
libswscale      7.  5.100 /  7.  5.100
libswresample   4. 12.100 /  4. 12.100
libpostproc    57.  3.100 / 57.  3.100
['ffmpeg', '-version']
return code: 0
ffmpeg CLI available
Loading filters...
Loading transitions...
G'MIC found
Player initialized with profile:  HD 1080p 30 fps
Create SDL1 consumer...
Autosave started...
Saving project...
GPU test results {'NVENC H.264 High Profile / .mp4': 0, 'NVENC HEVC / .mp4': 0, 'NVENC HEVC HDR / .mp4': 0, 'VAAPI H.264 / .mp4': -11}

[greenfork]

I have the same problem on the same OS -- Arch Linux

[jliljebl]

Are you running Wayland DE?

[greenfork]

I use Xorg

[greenfork]

More on mlt related errors: I tried shotcut, it shows same errors about mlt, but as far as I have tried it, works fine

[Perdu]

Xorg here too (not sure if it's in the trace)

[jliljebl]

Ok, thanks, which DE you are using (Gnome, Cinnamon...)?

[greenfork]

I use i3wm

[Perdu]

Same

[jliljebl]

Would it be possible for you test on Gnome DE (Gnome Shell)? I'm trying to establish if this is depended on DE when using X11. So far the reported BAD systems with X11 are i3wm and Openbox, I want to know some more mainline DEs still work.

[greenfork]

I tried this in Gnome on Xorg, same behavior

[schauveau]

You may want to try SDL12COMPAT_NO_QUIT_VIDEO=1

See #1134 (comment)

[Perdu]

This workaround does work for me

[jliljebl]

Ok, I'm closing this as duplicate of #1134, give all further comments there.